Method for adjusting sensitivity of touch panels

ABSTRACT

The present application relates to a method for adjusting the sensitivity of a touch panel. A look up table is built. The look up table includes a charging station look up table and a discharging station look up table. The charging station look up table includes a threshold value (V 0m ) of a touch signal, an electrical quantity (A 0i ) corresponding to the threshold value (V 0m ), and a computational method g 1 . The discharging station look up table includes the threshold value (V 0m ), the electrical quantity (A 0i ), and a computational method g 2 . The current electrical quantity and whether the capacitive touch panel is charging are detected. According to the current electrical quantity, the state of charging or discharging, and the computational method g 1  or g 2 , the threshold value (V 0m ) is adjusted.

RELATED APPLICATIONS

This application claims all benefits accruing under 35 U.S.C. §119 fromTaiwan Patent Application No. 100149637, filed on Dec. 29, 2011 in theTaiwan Intellectual Property Office, the disclosure of which isincorporated herein by reference.

BACKGROUND

1. Technical Field

The present application relates to a method for adjusting thesensitivity of touch panels.

2. Discussion of Related Art

In recent years, various electronic products have been equipped withoptically transparent touch panels in front of their display devicessuch as liquid crystal panels. A user of such electronic apparatus canpress the touch panel with a finger or a stylus while visually observingthe display device through the touch panel.

Capacitive touch panels have been widely used due to their highersensitivity. However, capacitive touch panels are susceptible tointerference, such as static electricity. If the capacitive touch panelis charging at the same time the capacitive touch panel is touched by auser, a total capacitance multiply effect will be formed between thecapacitive touch panel and the user. The capacitive touch panel is toosensitive at this moment. When electrical quantity of the capacitivetouch panel gradually reduces, the sensitivity of the capacitive touchpanel gradually reduces. The over-sensitivity and the reduction ofsensitivity of the capacitive touch panel affect the use of thecapacitive touch panel.

What is needed, therefore, is to provide a touch panel which canovercome the shortcoming described above.

BRIEF DESCRIPTION OF THE DRAWINGS

Many aspects of the embodiments can be better understood with referencesto the following drawings. The components in the drawings are notnecessarily drawn to scale, the emphasis instead being placed uponclearly illustrating the principles of the embodiments. Moreover, in thedrawings, like reference numerals designate corresponding partsthroughout the several views.

FIG. 1 is a flowchart of one embodiment of a method for adjusting thesensitivity of touch panel.

FIG. 2 is a schematic, top view of a touch panel.

FIG. 3 is a schematic, cross-sectional view of the touch panel of FIG.1.

FIG. 4 shows a Scanning Electron Microscope (SEM) image of a carbonnanotube layer.

FIG. 5 is a flowchart of one embodiment of a method for building a lookup table in a charging station.

FIG. 6 is a flowchart of one embodiment of a method for building a lookup table in a discharging station.

FIG. 7 is a schematic view of building a look up table in a chargingstation.

FIG. 8 is a schematic view of building a look up table in a dischargingstation.

DETAILED DESCRIPTION

The disclosure is illustrated by way of example and not by way oflimitation in the figures of the accompanying drawings in which likereferences indicate similar elements. It should be noted that referencesto “an” or “one” embodiment in this disclosure are not necessarily tothe same embodiment, and such references mean at least one.

Referring FIG. 1, one embodiment of a method for adjusting thesensitivity of a touch panel is shown. The method includes the steps of:

step (S1), building a look up table including a charging station look uptable and a discharging station look up table, wherein the chargingstation look up table includes a threshold value (V_(0m)) of a touchsignal, an electrical quantity (A_(0i)) corresponding to the thresholdvalue (V_(0m)), and a computational method g₁, the discharging stationlook up table includes the threshold value (V_(0m)), the electricalquantity (A_(0i)) corresponding to the threshold value (V_(0m)), and acomputational method g₂;

step (S2), detecting current electrical quantity, and determiningwhether the touch panel is charging; and

step (S3), adjusting the threshold value (V_(0m)), according to thecurrent electrical quantity, charging station, and the computationalmethod g₁ in the charging station look up table, or current electricalquantity, discharging station, and the computational method g₂ in thedischarging station look up table.

The method for adjusting the sensitivity of the touch panel is suitablefor a capacitive touch panel.

Referring to FIG. 2 and FIG. 3, a capacitive touch panel 10 of oneembodiment is shown. The touch panel 10 includes a substrate 12, anadhesive layer 13, a transparent conductive layer 14, a plurality ofelectrodes 16, and a conductive trace 18.

The touch panel 10 defines two areas: a touch-view area 10A and a tracearea 10B. The touch-view area 10A can be touched and viewed to realizethe control function. The trace area 10B is usually a periphery area ofthe touch panel 10 which can be used to support the conductive trace 18.The touch-view area 10A has a relatively large area which includes acenter area of the touch panel 10. The trace area 10B is located on atleast one side of the touch-view area 10A. The positional relationshipof the touch-view area 10A and the trace area 10B can be selectedaccording to need. In one embodiment, the touch-view area 10A is thecenter region having the same shape as the shape of the touch panel 10and surrounded by the trace area 10B.

The adhesive layer 13 is located on a surface of the substrate 12. Thetransparent conductive layer 14 and the conductive trace 18 are locatedon a surface of the adhesive layer 13. The plurality of sensingelectrodes 16 is located on a surface of the transparent conductivelayer 14. The transparent conductive layer 14 is located only on thetouch-view area 10A. The conductive trace 18 is located only on thetrace area 10B. The plurality of sensing electrodes 16 is located on atleast one side of the transparent conductive layer 14 and electricallyconnected with the transparent conductive layer 14 and the conductivetrace 18. The plurality of sensing electrodes 16 is spaced from eachother. The conductive trace 18 includes a plurality of conductive wires.The number of the plurality of conductive wires is the same as thenumber of the plurality of sensing electrodes 16. Each of the pluralityof conductive wires has a first end and a second end. The first end ofeach of the plurality of conductive wires is connected to each of theplurality of sensing electrodes 16. The second end of each of theplurality of conductive wires is electrically connected with an externalcontroller 11. The transparent conductive layer 14 is electricallyconnected with the external controller 11 through the conductive trace18 and the plurality of sensing electrodes 16, to transmit electricalsignals between the plurality of sensing electrodes 16 and the externalcontroller 11.

The adhesive layer 13 is optional. The transparent conductive layer 14,the plurality of sensing electrodes 16 and the conductive trace 18 areplated on the surface of the substrate 12. The transparent conductivelayer 14 has a good adhesive property, and the transparent conductivelayer 14 can be directly bonded to the surface of the substrate 12without the adhesive layer 13.

The transparent conductive layer 14 can be a carbon nanotube layer, aconductive indium tin oxide (ITO) layer, or a conductive antimony tinoxide (TAO) layer.

The carbon nanotube layer includes a carbon nanotube film. The carbonnanotube film includes a plurality of carbon nanotubes. The carbonnanotube film can be a substantially pure structure of carbon nanotubes,with few impurities and chemical functional groups. A majority of thecarbon nanotubes are arranged to extend along the directionsubstantially parallel to the surface of the carbon nanotube film.

The carbon nanotube film is a free-standing structure. The term“free-standing structure” means that the carbon nanotube film cansustain the weight of itself when it is hoisted by a portion thereofwithout any significant damage to its structural integrity. Thus, thecarbon nanotube film can be suspended by two spaced supports. Thefree-standing carbon nanotube film can be laid on the epitaxial growthsurface directly and easily.

In one embodiment, the transparent conductive layer 14 is a singlecarbon nanotube film. The carbon nanotube film includes a plurality ofsuccessive and oriented carbon nanotubes joined end-to-end by van derWaals attractive force therebetween. The carbon nanotube film is afree-standing film. Referring to FIG. 4, each carbon nanotube filmincludes a plurality of successively oriented carbon nanotube segmentsjoined end-to-end by van der Waals attractive force therebetween. Eachcarbon nanotube segment includes a plurality of carbon nanotubesparallel to each other, and combined by van der Waals attractive forcetherebetween. The carbon nanotubes in the carbon nanotube film areoriented along a preferred orientation.

In step (S1), the look up table can be stored on the external controller11. The look up table includes the charging station look up table andthe discharging station look up table.

Referring to FIG. 5, one embodiment of a method for building thecharging station look up table based on the capacitive touch panel 10includes the following steps:

step (S11), detecting the electrical quantity (A_(0i)) of a moment (t),and touching the transparent conductive layer 14 at the moment (t), toobtain a first sensing signal (V_(0i)) of a touch point 19, and settingthe threshold value (V_(0m)), wherein the sensing signal (V_(0i)) isgreater than the threshold value (V_(0m));

step (S12), detecting an electrical quantity (A_(1i)) of the next moment(t+1), and touching the transparent conductive layer 14 at the moment(t+1), to obtain a second sensing signal (V_(1i)) of the touch point 19,and setting a threshold value (V_(1m)) of the touch signal, wherein thesensing signal (V_(1i)) is greater than the threshold value (V_(1m)),the electrical quantity (A_(1i)) at the moment (t+1) is greater than theelectrical quantity (A_(0i)) at the moment (t), andV_(0i)−V_(0m)=V_(1i)−V_(1m); and

step (S 13), building an equation f₁ and an equation f₂, wherein theequation f₁ can be built using various algorithms as long as theequation f₁ meets the conditions: f₁(V_(0i), A_(0i), A_(1i))=V_(1i), theequation f₂ can be built using various algorithms as long as theequation f₂ meets the conditions: f₂ (V_(0m), V_(1i), V_(0i))=V_(1m),according to the equation f₁ and the equation f₂, to obtain thecomputational method g₁, the computational method g₁ meets theconditions: g₁(V_(0m), A_(0i), A_(ni))=V_(nm), wherein an electricalquantity of a moment (t+n) is defined as A_(ni), a threshold value atthe moment (t+n) is defined as V_(nm).

In the process of charging, the electrical quantity of the capacitivetouch panel 10 rapidly rises, so the electrical quantity (A_(1i)) at themoment (t+1) is greater than the electrical quantity (A_(0i)) at themoment (t).

The letters i and n represent the moment of touching the capacitivetouch panel 10. i=1, 2, 3 . . . (i>0), m=0, 1, 2, 3 . . . (m≧0), n=0, 1,2, 3 . . . (n≧0).

The equations f₁ and f₂ can be built using various algorithms as long asthe equations f₁ and f₂ meet the conditions: f₁(V_(0i), A_(0i),A_(1i))=V_(1i), f₂ (V_(0m), V_(1i), V_(0i))=V_(1m). In one embodiment,the equation f₁ reflects a ratio of the product of the sensing signal(V_(0i)) and the electrical quantity (A_(1i)) to the electrical quantity(A_(0i)). The equation f₁ can be represented by

${\frac{L_{0i} \times V_{0i} \times A_{1i}}{A_{0i}} = V_{1i}},$wherein L_(0i) is a coefficient of

$\frac{V_{0i} \times A_{1i}}{A_{0i}}$for converting into V_(1i). The equation f₂ reflects a ratio of theproduct of the threshold value (V_(0m)) and the sensing signal (V_(1i))to the sensing signal (V_(0i)). The equation f₂ can be represented by

${\frac{K_{0i} \times V_{0m} \times V_{1i}}{V_{0i}} = V_{1m}},$wherein K_(0i) is a coefficient of

$\frac{V_{0m} \times V_{1i}}{\; V_{0i}}$for converting into V_(1m). According to the equations f₁ and f₂, thecomputational method g₁ can be obtained. The computational method g₁meets the condition:

$\frac{L_{0i} \times K_{0i} \times V_{0m} \times A_{ni}}{A_{0i}} = {V_{n\; m}.}$

Referring to FIG. 6, one embodiment of a method for building thedischarging station look up table based on the capacitive touch panel 10includes the following steps:

step (S11 a), detecting the electrical quantity (A_(0i)) of a moment(t), and touching the transparent conductive layer 14 at the moment (t),to obtain a third sensing signal (V_(0i)) of the touch point 19, andsetting the threshold value (V_(0m)), wherein the sensing signal(V_(0i)) is greater than the threshold value (V_(0m));

step (S12 a), detecting an electrical quantity (A_(1i)′) of the nextmoment (t+1), and touching the transparent conductive layer 14 at themoment (t+1), to obtain a fourth sensing signal (V_(1i)′) of the touchpoint 19, and setting a threshold value (V_(1m)′) of the touch signal,wherein the sensing signal (V_(1i)′) is greater than the threshold value(V_(1m)′), the electrical quantity (A_(0i)) at the moment (t) is greaterthan the electrical quantity (A_(1i)′) at the moment (t+1), andV_(0i)−V_(0m)=V_(1i)′−V_(1m)′; and

step (S13 a), building an equation f₁′ and an equation f₂′, the equationf₁′ can be built using various algorithms as long as the equation f₁′meets the conditions: f₁′(V_(0i), A_(0i), A_(1i)′)=V_(1i)′, the equationf₂′ can be built using various algorithms as long as the equation f₂′meets the conditions: f₂′(V_(0m), V_(1i)′, V_(0i))=V_(1m)′, according tothe equations f₁′ and f₂′, to obtain the computational method g₂, thecomputational method g₂ meets the conditions: g₂(V_(0m), A_(0i),A_(ni)′)=V_(nm)′, wherein an electrical quantity of a moment (t+n) isdefined as A_(ni)′, a threshold value at the moment (t+n) is defined asV_(nm)′.

In the process of discharging, the electrical quantity of the capacitivetouch panel 10 gradually reduces, so the electrical quantity (A_(0i)) atthe moment (t) is greater than the electrical quantity (A_(1i)′) at themoment (t+1).

The letters i and n represent the moment of touching the capacitivetouch panel 10. i=1, 2, 3 . . . (i>0), m=0, 1, 2, 3 . . . (m≧0), n=0, 1,2, 3 . . . (n≧0).

The equations f₁′ and f₂′ can be built using various algorithms as longas the equations f₁′ and f₂′ meet the conditions: f₁′(V_(0i), A_(0i),A_(1i)′)=V_(1i)′, f₂′(V_(0m), V_(1i)′, V_(0i))=V_(1m)′. In oneembodiment, the equation f₁′ reflects a ratio of the product of thesensing signal (V_(0i)) and the electrical quantity (A_(1i)′) to theelectrical quantity (A_(0i)). The equation f₁′ can be represented by

${\frac{M_{0i} \times V_{0i} \times A_{1i}^{\prime}}{A_{0i}} = V_{1i}^{\prime}},$wherein M_(0i) is a coefficient of

$\frac{V_{0i} \times A_{1i}^{\prime}}{A_{0i}}$for converting into V_(1i)′. The equation f₂′ reflects a ratio of theproduct of the threshold value (V_(0m)) and the sensing signal (V_(1i)′)to the sensing signal (V_(0i)). The equation f₂′ can be represented by

${\frac{N_{0i} \times V_{0m} \times V_{1i}^{\prime}}{V_{0i}} = V_{1m}^{\prime}},$wherein N_(0i) is a coefficient of

$\frac{V_{0m} \times V_{1i}^{\prime}}{V_{0i}}$for converting into V_(1m)′. According to the equations f₁′ and f₂′, thecomputational method g₂ can be obtained. The computational method g₂meets the condition:

$\frac{M_{0i} \times N_{0i} \times V_{0m} \times A_{ni}^{\prime}}{A_{0i}} = {V_{n\; m}^{\prime}.}$

The touch point 19 can be a single touch point or a plurality of touchpoints formed by an input device sliding on the capacitive touch panel10. The touch point 19 can also be a plurality of touch points formed bya plurality of input devices touching the capacitive touch panel 10. Inone embodiment, the touch point 19 includes the plurality of touchpoints. The threshold values of the plurality of touch points are thesame at the same moment. The threshold value and the sensing signal canbe a voltage value, or the threshold value and the sensing signal can bea capacitance value.

In step (S2), an electrical quantity (A_(ni)) is detected at a moment,and whether the capacitive touch panel 10 is charging is also detectedat the moment. The electrical quantity (A_(ni)) and a signal of whetherthe capacitive touch panel 10 is charging are transmitted to thecapacitive touch panel 10 by a device 20. A method for transmitting theelectrical quantity (A_(ni)) to the capacitive touch panel 10 can beselected according to need. A method for transmitting the signal ofwhether the capacitive touch panel 10 is charging to the capacitivetouch panel 10 can be selected according to need. The method fortransmitting the electrical quantity (A_(ni)) and the signal can be I2C,SPI, UART, and GPIO.

In step (S3), the capacitive touch panel 10 receives the signal of thecharging station and the electrical quantity at the charging station.The capacitive touch panel 10 receives the signal of the dischargingstation and the electrical quantity at the discharging station.According to the look up table, the threshold value of the touch signalis adjusted.

Referring to FIG. 2 and FIG. 7, an example illustrates how to build thecharging station look up table. In the example, i=1 and m=0.

The device 20 detects the electrical quantity (A₀₁) at the moment (t),and the electrical quantity (A₀₁) is about 20 milliamps. The transparentlayer 14 is touched at the moment (t), to obtain a sensing voltage (V₀₁)of the touch point 19. The sensing voltage (V₀₁) is about 2 volts. Athreshold voltage (V₀₀) is set, and the threshold voltage (V₀₀) is setto about 1 volt.

The device 20 detects the electrical quantity (A₁₁) at the moment (t+1),and the electrical quantity (A₁₁) is about 30 milliamps. The transparentlayer 14 is touched at the moment (t+1), to obtain a sensing voltage(V₁₁) of the touch point 19, the sensing voltage (V₁₁) is about 4 volts.Setting a threshold voltage (V₁₀), because V₀₁−V₀₀=V₁₁−V₁₀, thethreshold voltage (V₁₀) is about 3 volts.

The equation f₁ meets the condition: f₁(V₀₁, A₀₁,A₁₁)=(4/3)×V₀₁A₁₁/A₀₁=V₁₁, because A₀₁=20, V₀₁=2, A₁₁=30, V₁₁=4,L₀₁×V₀₁A₁₁/A₀₁=V₁₁, and L₀₁=4/3. The equation f₂ meets the condition:f₂(V₀₀, V₁₁, V₀₁)=(3/2)×V₀₀V₁₁/V₀₁=V₁₀, because V₀₀=1, V₀₁=2, V₁₀=3,V₁₁=4, K₀₁×V₀₀V₁₁/V₀₁=V₁₀, and K₀₁=3/2. According to the equations f₁and f₂, the computational method g₁ is obtained. The computationalmethod g₁ meets the conditions:(4/3)×(3/2)×V₀₀A_(n1)/A₀₁=2×V₀₀A_(n1)/A₀₁=V_(n0), n=0, 1, 2, 3 . . .(n≧0). Therefore, the charging station look up table includes thethreshold voltage (V₀₀), the electrical quantity (A₀₁) corresponding tothe threshold voltage (V₀₀), and the computational method g₁, whereinthe computational method g₁ meets the condition: g₁(V₀₀,A₀₁)=2×V₀₀A_(n1)/A₀₁=V_(n0).

The device 20 detects the current electrical quantity (A_(n1)) of thecapacitive touch panel 10 at the moment (t+n). The device 20 receivesthe signal of the charging station and the electrical quantity (A_(n1))at the charging station. If the electrical quantity (A₀₁) is about 40milliamps, according to the charging station look up table, thethreshold value (V_(n0)) is adjusted to be about 4 volts.

Referring to FIG. 2 and FIG. 8, an example illustrates how to build thedischarging station look up table. In the example, i=1 and m=0.

The device 20 detects the electrical quantity (A₀₁) at the moment (t),and the electrical quantity (A₀₁) is about 60 milliamps. The transparentlayer 14 is touched at the moment (t), to obtain a sensing voltage (V₀₁)of the touch point 19. The sensing voltage (V₀₁) is about 5 volts. Athreshold voltage (V₀₀) is set, and the threshold voltage (V₀₀) is setto about 4 volts.

The device 20 detects the electrical quantity (A₁₁′) at the moment(t+1), and the electrical quantity (A₁₁′) is about 50 milliamps. Thetransparent layer 14 is touched at the moment (t+1), to obtain a sensingvoltage (V₁₁′) of the touch point 19. The sensing voltage (V₁₁′) isabout 4.5 volts. A threshold voltage (V₁₀′) is set, becauseV₀₁−V₀₀=V₁₁′−V₁₀′, and the threshold voltage (V₁₀′) is about 3.5 volts.

The equation f₁′ meets the condition: f₁′(V₀₁, A₀₁,A₁₁′)=(54/50)×V₀₁A₁₁′/A₀₁=V₁₁′, because A₁₁′=50, A₀₁=60, V₁₁′=4.5,V₀₁=5, and M₀₁×A₁₁′/A₀₁=V₁₁′/V₀₁, M₀₁=54/50. The equation f₂′ meets theconditions: f₂′(V₀₀, V₁₁′, V₀₁)=(35/36)×V₀₀V₁₁′/V₀₁=V₁₀′, becauseV₁₁′=4.5, V₀₁=5, V₁₀′=3.5, V₀₀=4, and N₀₁×V₀₀V₁₁′N₀₁=V₁₀′, N₀₁=35/36.According to the equations f₁′ and f₂′, the computational method g₂ isobtained. The computational method g₂ meets the conditions:(54/50)×(35/36)×V₀₀ A_(n1)′/A₀₁=(105/4)×V₀₀A_(n1)′/A₀₁=V_(n0)′, n=0, 1,2, 3 . . . (n≧0). Therefore, the discharging station look up tableincludes the threshold voltage (V₀₀), the electrical quantity (A₀₁)corresponding to the threshold voltage (V₀₀), and the computationalmethod g₂, wherein the computational method g₂ meets the conditions:g₂(V₀₀, A₀₁)=(21/20)×V₀₀A_(n1)′/A₀₁=V_(n0)′.

The device 20 detects an electrical quantity (A_(n1)′) of the capacitivetouch panel 10 at the moment (t+n). The device 20 receives the signal ofdischarging station and the electrical quantity (A_(n1)′) at thedischarging station. If the electrical quantity (A₀₁′) is about 40milliamps, according to the discharging station look up table, thethreshold value (V_(n0)′) is adjusted to be about 2.8 volts.

The equations f₁, f₂, f₁′, and f₂′ can be built using variousalgorithms, for example, a ratio, a difference value, or more complexforms. Building the equations f₁, f₂, f₁′, and f₂′ can be based on theelectrical quantity, sensing signal of the touch point 19, and thethreshold voltage corresponding to the sensing signal at differentmoments. With the electrical quantity, sensing signal of the touch point19, and the threshold voltage corresponding to the sensing signal atmore moments, the equation f₁, f₂, f₁′, and f₂′ can be accuratelydetermined. Therefore, the computational method g₁ and g₂ are moreaccurate.

In summary, the current electrical quantity and where the capacitivetouch panel 10 is charging are detected. The threshold value of thetouch signal is changed by querying the look up table. The look up tablecan be built in advance on the external controller 11. Therefore, withthe changing of the strength of the touch signal, the threshold valuecorresponding to the strength of the touch signal can be adjusted. Thesensitivity of the capacitive touch panel 10 can be also adjusted.

It is to be understood that the above-described embodiment is intendedto illustrate rather than limit the disclosure. Variations may be madeto the embodiment without departing from the spirit of the disclosure asclaimed. The above-described embodiments are intended to illustrate thescope of the disclosure and not restricted to the scope of thedisclosure.

It is also to be understood that the above description and the claimsdrawn to a method may include some indication in reference to certainsteps. However, the indication used is only to be viewed foridentification purposes and not as a suggestion as to an order for thesteps.

What is claimed is:
 1. A method for adjusting a sensitivity of acapacitive touch panel, the method comprising: building a look up tablecomprising a charging station look up table and a discharging stationlook up table, wherein the charging station look up table comprises athreshold value (V_(0m)) of a touch signal, an electrical quantity(A_(0i),) corresponding to the threshold value (V_(0m)), and acomputational method g₁; and the discharging station look up tablecomprises the threshold value (V_(0m)), the electrical quantity(A_(0i)), and a computational method g₂, wherein building the chargingstation look up table comprises: detecting the electrical quantity(A_(0i)) at a moment (t) and touching the capacitive touch panel at themoment (t) to obtain a sensing signal (V_(0i)) of a touch point, whereinthe sensing signal (V_(0i)) is set greater than a threshold value(V_(0m)); detecting an electrical quantity (A_(1i)) at a next moment(t+1), and touching the capacitive touch panel at the next moment (t+1),to obtain a sensing signal (V_(1i)) of the touch point, wherein thesensing signal (V_(1i)) is set greater than a threshold value (V_(1m)),the electrical quantity (A_(1i)) at the moment (t+1) is greater than theelectrical quantity (A_(0i)) at the moment (t), andV_(0i)−V_(0m)=V_(1i)−V_(1m); and building an equation f₁ meeting acondition f₁(V_(0i), A_(0i),A_(1i))=V_(1i), and building an equation f₂meeting a condition f₂ (V_(0m)V_(1i),V_(0i))=V_(1m), to obtain thecomputational method g₁, wherein an electrical quantity of a moment(t+n) is defined as A_(ni), threshold value at the moment (t+n) asV_(nm), the computational method g₁ meets the conditions:g₁(V_(0m)A_(0i), A_(ni))=V_(nm); detecting a current electricalquantity; determining whether the capacitive touch panel is charging;and adjusting the threshold value (V_(0m)), according to the currentelectrical quantity, the state of charging or discharging, and thecomputational method g₁ or g₂.
 2. The method of claim 1, wherein theequation f₁ is represented by${\frac{L_{0i} \times V_{0i} \times A_{1i}}{A_{0i}} = V_{1i}},$ L_(0i)is a coefficient of $\frac{V_{0i} \times A_{1i}}{A_{0i}}$ for convertinginto V_(1i); the equation f₂ is represented by${\frac{K_{0i} \times V_{0m} \times V_{1i}}{V_{0i}} = V_{1m}},$ andK_(0i) is a coefficient of $\frac{V_{0m} \times V_{1i}}{V_{0i}}$ forconverting into V_(1m).
 3. The method of claim 1, wherein thecomputational method g₁(V_(0m), A_(0i), A_(ni)) meets a condition$\frac{L_{0i} \times K_{0i} \times V_{0m} \times A_{ni}}{A_{0i}} = {V_{n\; m}.}$4. The method of claim 1, wherein building the discharging station lookup table comprises: detecting the electrical quantity (A_(0i)) at themoment (t), and touching the capacitive touch panel at the moment (t),to obtain the sensing signal (V_(0i)) of a touch point, wherein thesensing signal (V_(0i)) is set greater than the threshold value(V_(0m)); detecting an electrical quantity (A_(1i)′) at the next moment(t+1), and touching the capacitive touch panel at the next moment (t+1),to obtain a sensing signal (V_(1i)′) of the touch point, wherein thesensing signal (V_(1i)′) is set greater than a threshold value(V_(1m)′), the electrical quantity (A_(0i)) at the moment (t) is greaterthan the electrical quantity (A_(1i)′) at the moment (t+1), andV_(0i)−V_(0m)=V_(1i)′−V_(1m)′; and building an equation f₁′and anequation f₂′, the equation meeting a condition: f₁′, (V_(0i), A_(0i),A_(1i)′)=V_(1i)′, the equation f₂′meeting a condition f₂′(V_(0m),V_(1i)′, V_(0i))=V_(1m)′, wherein an electrical quantity at a moment(t+n) is defined as A_(ni)′, a threshold value at the moment (t+n) isdefined as V_(nm)′, and the computational method g₂ meets a conditions:g₂(V_(0m), A_(0i), A_(ni)′)=V_(nm)′.
 5. The method of claim 4, whereinthe equation f₁′ is represented by${\frac{M_{0i} \times V_{0i} \times A_{1i}^{\prime}}{A_{0i}} = V_{1i}^{\prime}},$M_(0i) is a coefficient of$\frac{V_{0i} \times A_{1i}^{\prime}}{A_{0i}}$ for converting intoV_(1i)′; the equation f₂′ is represented by${\frac{N_{0i} \times V_{0m} \times V_{1i}^{\prime}}{V_{0i}} = V_{1m}^{\prime}},$and N_(0i), is a coefficient of$\frac{V_{0m} \times V_{1i}^{\prime}}{V_{0i}}$ for converting intoV_(1m)′.
 6. The method of claim 4, wherein the computational method g₂meets a condition$\frac{M_{0i} \times N_{0i} \times V_{0m} \times A_{ni}^{\prime}}{A_{0i}} = {V_{n\; m}^{\prime}.}$7. The method of claim 1, wherein the threshold value and the sensingsignal are voltage values or capacitance values.
 8. The method of claim1, wherein the capacitive touch panel comprises a transparent conductivelayer, and the transparent conductive layer is a carbon nanotube layer,a conductive indium tin oxide layer, or a conductive antimony tin oxidelayer.